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Stockholders' (Deficiency) (Details Narrative) (USD $)
9 Months Ended
Apr. 30, 2015
Jul. 31, 2014
Common stock issued, or committed to issue, Shares 3,470,513us-gaap_CommonStockSharesIssued 778,512,092us-gaap_CommonStockSharesIssued
Common stock issued, or committed to issue, Amount $ 806,477us-gaap_CommonStockValue $ 778,512us-gaap_CommonStockValue
Common stock, value per share $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Conversion of shares of Series E, Convertible Preferred Stock 40,833,335GNBT_ConversionOfSharesOfSeriesEConvertiblePreferredStock  
Warrants Outstanding 239,788,852us-gaap_ClassOfWarrantOrRightOutstanding  
Number of shares to be purchased, exercise price $ 0.03us-gaap_FairValueAssumptionsExercisePrice $ 0.03us-gaap_FairValueAssumptionsExercisePrice
Series F Convertible Preferred Stock    
Conversion of shares of Series F, Convertible Preferred Stock 387GNBT_ConversionOfSharesOfSeriesFConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
 
Make-Whole Dividend Payments    
Common stock issued, or committed to issue, Shares 5,187,021us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= GNBT_MakeWholeDividendPaymentsMember
 
Upon Exercise Of Options    
Common stock issued, or committed to issue, Shares 6,416us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= GNBT_UponExerciseOfOptionsMember
 
Common stock issued, or committed to issue, Amount 6,416,316us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= GNBT_UponExerciseOfOptionsMember
 
Common stock, value per share $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= GNBT_UponExerciseOfOptionsMember
 
Cash proceeds 542GNBT_ProceedsFromIssuanceOfWarrants1
/ us-gaap_StatementClassOfStockAxis
= GNBT_UponExerciseOfOptionsMember
 
Warrants Outstanding, Exercise price $0.84    
Total Warrants Outstanding, Shares 17,542,402GNBT_Warrants
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_WarrantExercise84Member
 
Outstanding warrants, weighted average exercise price $ 0.03GNBT_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_WarrantExercise84Member
 
Outstanding warrants, weighted average remaining life (in years) 2 years 8 months  
Warrants Outstanding, Exercise Price $0.03    
Total Warrants Outstanding, Shares 239,788,852GNBT_Warrants
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_WarrantExercisePrice03Member
 
Outstanding warrants, weighted average exercise price $ 0.03GNBT_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_WarrantExercisePrice03Member
 
Derivative Warrant Liability    
Warrants, Total $ 2,689,240us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_DerivativeWarrantLiabilityMember
 
Total Warrants Outstanding, Shares 239,788,852GNBT_Warrants
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_DerivativeWarrantLiabilityMember